Novel Process for the Synthesis of Class I Antiarrhythmic Agent (±)-Cibenzoline and Its Analogs
作者:Atul R. Gholap、Vincent Paul、Kumar V. Srinivasan
DOI:10.1080/00397910802006388
日期:2008.8.18
Abstract Synthesis of (±)-cibenzoline and its analogs has been achieved by a simple sequence of reactions. The diaryl cyanoolefin intermediate 3 could be prepared by Knoevenagel condensation of benzophenone with ethylcyanoacetate to form the tetra-substituted olefin intermediate 2 followed by Krapcho deethoxycarbonylation or from β-hydroxynitrile intermediate 2′ followed by the elimination of hydroxyl
摘要 (±)-cibenzoline 及其类似物的合成已通过简单的反应序列实现。二芳基氰基烯烃中间体 3 可以通过二苯甲酮与氰基乙酸乙酯的 Knoevenagel 缩合形成四取代的烯烃中间体 2,然后 Krapcho 脱乙氧基羰基化或由 β-羟基腈中间体 2' 分别消除羟基来制备。2,2-二苯基环丙烷甲腈 4 由中间体 3 通过环丙烷化合成,在催化量的硫存在下与乙二胺反应转化为 (±)-2-(2,2-二苯基环丙基)-2-咪唑啉 5 . 此外,获得的 2-咪唑啉以良好到中等的产率顺利氧化为相应的咪唑 6。